Abstract: A modular display system comprises a plurality of identical modules. Each module includes a vertical mounting surface, a pair of sidewalls, top surface and a bottom surface lying in planes which extend at right angles to the mounting surface. A pair of top rails lie above the top plane and form outward facing channels. A pair of bottom rails extend inward from respective sidewalls just above the bottom plane, each bottom rail engaging in a respective channel when two modules are assembled one above the other. The inner surfaces of at least one of the top rails and the bottom rails converge toward the top or bottom plane at an acute angle so that the inner surfaces of the top rails are received against the inner surfaces of the bottom rails in a press fit. The modules are latched in this position by a detent and shoulder arrangement.

Abstract: A portable computer-based device, for example a PDA, a cell phone, or a notebook, may be used as an operator control element for second computer-based devices. The portable computer-based device is enabled to emulate mouse and keyboard inputs the second device and to transfer them to the second computer-based device which is to be remote-controlled.

Abstract: The invention pertains to an electronic device with a graphic surface, such as a display, on which image contents of programs are displayed in windows. If the image content is too large for the window of the application program, scroll bars are arranged on the side of the window.